<template>
  <div class="todo-footer">
    <label>
      <input type="checkbox" v-model="allComplate" />
    </label>
    <span>
      <span>已完成{{ complateNum }}</span> / 全部{{ todoList.length }}</span
    >
    <button class="btn btn-danger">清除已完成任务</button>
  </div>
</template>

<script>
export default {
  name: "Footer",
  props: ["todoList", "changeAllDone"],
  computed: {
    complateNum() {
      return this.todoList.reduce((p, c) => (c.done ? p + 1 : p), 0);
    },
    allComplate: {
      get() {
        // return this.todoList.every((item) => item.done) && this.todoList.length > 0;
        return (
          this.complateNum === this.todoList.length && this.todoList.length > 0
        );
      },
      set(value) {
        this.changeAllDone(value);
      },
    },
  },
};
</script>

<style scoped>
/*footer*/
.todo-footer {
  height: 40px;
  line-height: 40px;
  padding-left: 6px;
  margin-top: 5px;
}

.todo-footer label {
  display: inline-block;
  margin-right: 20px;
  cursor: pointer;
}

.todo-footer label input {
  position: relative;
  top: -1px;
  vertical-align: middle;
  margin-right: 5px;
}

.todo-footer button {
  float: right;
  margin-top: 5px;
}
</style>
